Linear Regression Review

Front

What is the y-intercept in the equation y = -5 - 4x?

Back

-5

Front

In the linear regression equation y = 40x + 100, what does the y-intercept represent?

Back

The predicted weight of the rat at birth.

Front

In the equation y = 61.93x - 1.79, how can the slope be interpreted?

Back

They drove at a speed of 61.93 miles per hour.

Front

How many chapters would be in a book with 180 pages based on the trend line from the scatter plot?

Back

18 chapters

Front

What is the estimated correlation coefficient for a scatterplot with a strong positive relationship?

Back

r = 0.89

Front

Define linear regression.

Back

A statistical method used to model the relationship between a dependent variable and one or more independent variables.

Front

What does the slope of a linear regression line represent?

Back

The rate of change of the dependent variable for each unit change in the independent variable.

Front

What is the formula for a linear regression line?

Back

y = mx + b, where m is the slope and b is the y-intercept.

Front

What does a correlation coefficient of r = 1 indicate?

Back

A perfect positive linear relationship between two variables.

Front

What does a correlation coefficient of r = -1 indicate?

Back

A perfect negative linear relationship between two variables.